Plant Physiol.
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Plant Physiology 51:350-356 (1973)
© 1973 American Society of Plant Biologists

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Articles

Characteristics of Nitrate Reduction in a Mutant of the Blue-Green Alga Agmenellum quadruplicatum1

S. E. Stevens, Jr.2 and Chase Van Baalen

a University of Texas Marine Science Institute, Port Aransas, Texas 78373

Characteristics of nitrate reduction in terms of nitrite production in an N-methyl-N'-nitro-N-nitrosoguanidine-induced mutant of the blue-green alga Agmenellum quadruplicatum are described. Following induction of nitrate reduction a linear rate of nitrite production proportional to cell concentration was observed. Rate of nitrite production and growth rate showed similar responses to pH, temperature, and light intensity. If required, only trace amounts of carbon dioxide were necessary for nitrite production. Atmospheres of oxygen or nitrogen inhibited production of nitrite. In addition, a low but constant rate of nitrite production was observed in the dark. Nitrite production by mutant AQ-6 was studied in terms of photosynthesis. As nitrite production proceeded, rate of photosynthesis declined. Ultraviolet irradiation and 3-(3,4-dichlorophenyl)-1, 1-dimethylurea poisoning did not prevent nitrite production. The action spectrum of nitrite production was chlorophyll a-like.

2 Present address: Department of Zoology, University of Texas, Austin, Texas 78712.

1 An early part of this study was supported by National Science Foundation Grant GB 8461. S. E. S. is indebted to the Environmental Health Engineering Department of the University of Texas for a traineeship awarded under United States Public Health Service Grant UI 01046.






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Copyright © 1973 by the American Society of Plant Biologists